Yes, sieur is in the scrabble dictionary

...and is worth 6 points by itself.

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Sieur Definition

noun

Sir; -- a title of respect used by the French.
from the GNU version of the Collaborative International Dictionary of English

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Top Words by points

Points

sieur

5

2 letter words with SIEUR

Points

es

2

is

2

er

2

re

2

si

2

us

2

3 letter words with SIEUR

Points

sue

3

sri

3

sir

3

ser

3

sei

3

use

3

rue

3

res

3

rei

3

ire

3

ers

3

4 letter words with SIEUR

Points

sure

4

suer

4

user

4

sire

4

ruse

4

rues

4

rise

4

reis

4

ires

4

5 letter words with SIEUR

Points

sieur

5

Found 27 words in 0.17995 seconds